Questions tagged [igmp]

For questions about IGMP (Internet Group Management Protocol), a protocol used for communications between IPv4 hosts and multicast routers to establish and maintain host multicast group membership.

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AMS-2600 Odd behavior - Ports Bouncing [on hold]

I have an AMS-2600, that upon looking in the log, I noticed that several ports (around 8-10), bounce with the following error : LINK-UPDOWN: Interface GigabitEthernet 1/6, changed state to down. ...
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1answer
57 views

Multicast in one VLAN

I need to receive multicast traffic over L2 segment on my client machine. But for some reason I am unable to do it. To my understanding with such scheme I should receive traffic if inbetween Juniper ...
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56 views

To multicast or not to multicast over LTE? [closed]

I have an IOT device with static IP connected to a Mikrotik LTE device on ether1. The IOT host sends a multicast packet every second. The packet contains the IP and MAC of the host. IP-Multicast: ...
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1answer
52 views

IGMP leave group

Would like to have some clarification on following scenario: There is Linux platform with an Ethernet interface which has some constant default IP address (eth0: 10.0.0.1) and some changing IP ...
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3answers
881 views

OSPF and its use of Multicast

When it comes to OSPF and its use of multicast, am I correct in believing that IGMP forwarding and an IGMP querier is still required within the local segment? My understanding would be without this, ...
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1answer
175 views

Understanding IP multicast in linux [closed]

My ultimate goal is to setup IGMP snooping on a linux machine using netfilter hooks. This is for exploratory purposes to understand IGMP protocol. The topology we are using is as follows: | ...
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1answer
752 views

Using IGMP but Multicast still Flooding

Im new here. I want to ask about the multicast, The first case is, I have switch HP 2530 24 port with 24 10/100 and 2 100/1000 NIC, And i have servers with bandwidth video multicast around 120-...
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1answer
676 views

Multicast flooding network ProCurve Switch 2520G

Switch: ProCurve Switch 2520G-8-PoE Scenario: Multicast is flooded onto the network Having multicast flooded makes it so TV is stuttering and pixelating. I do on my ProCurve have IGMP and Querier ...
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3answers
436 views

Multicast routing on Huawei Quidway 5300 Switches

I have been testing a scenario which involves multicast routing for multicast traffic the scenario is pretty simple. I have two L3 switches with OSPF running in between them, two computers are ...
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2answers
1k views

Aruba 2530 - IGMP Enabled, Querier on still no filtering

I have a in port 1 - 5 channels of multicast. On port 2 i have a computer. Both are in VLAN 10 untagged and a more bigger network tagged on port 3. I've enabled IGMP with: config, vlan 10, ip igmp, ...
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2answers
2k views

IGMP and multicast forwarding

So my question is, will using IGMP alone(without IGMP snooping, PIM...etc) making router forwarding multicast traffic? I'm working on a buggy switch, but I don't know about networking too, so I'm ...
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0answers
255 views

STB generate IGMP Leave without reason

In my network STB generates IGMP Leave (in STB logs "End of Stream") without any reason or there is something what I don't understand. There is one exeption STB directly connected to PIM (ASR920) ...
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2answers
4k views

Multicast between VLANs

I've following scenario Upper computer on VLAN 10 is sending some multicast messages and lower computer on VLAN 10 sends IGMP join periodically. Lets say MC address is 224.1.1.1 Now, computer on ...
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137 views

ASR920 - port Te0/0/3-tefp1 is not a router port on Vlan 217

When I enabled debugging: PIM#debug ip igmp snooping router I get in logs: Mar 30 15:58:36.275: IGMPSN: router: port Te0/0/3-tefp1 is not a router port on Vlan 217 Configuration for interfaces: ...
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1answer
44 views

Should igmp table lookup misses flood to all ports?

With igmp snooping, upon receiving a multicast packet it looks up the table and decides which ports to forward the packet. What I'm wondering is, if there is not an entry in the table for that ...
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1answer
148 views

Question Regarding IGMPv3 behaviour: Multicast Router appears to send Membership Report?

I'm new to how IGMP works. Recently, I was looking at a packet capture: I see that 172.18.1.3 sends a membership query to the all hosts address, leading me to assume that 172.18.1.3 is a multicast ...
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1answer
256 views

Rationale for EXCLUDE mode in mutlicast IGMPv3 / MLDv2

Both IGMPv3 and MLDv2 have an include and an exclude mode, where a multicast listener can specify to either listen only for packets from some list of source addresses (include) or only for packets ...
2
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1answer
706 views

IGMP snooping across VLANs

Set up: Core switch: C1 C1 is an L3 switch--there is no router Access switches: A1, A2, A3 VLANs: V1, V2 Hosts: H11, H12, H13, H21, H22, etc. Connections: C1 connects to A1, A2, A3 A1, A2, A3 each ...
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3answers
890 views

Minimum possible size of Ethernet/IGMP frames

I am writing an application that needs to ignore frames whose size is smaller than the minimum possible size of Ethernet/IGMP frames. I have researched extensively and found the following information: ...
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1answer
462 views

Unable to route multicast from IPcam (four vlans, one switch, one router with router-on-a-stick)

Okay, so I've been searching far and wide for a solution to my problem here. I want to be able to access an IPcam through its respective software across VLANs. Hardware: Cisco 1841 Router, firmware ...
4
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1answer
798 views

Multicast timer expires

I've a multicast network for security cameras (multiple RPs, bsr, connectivity with OSPF). The problem is that the monitors sometimes stop receiving the video stream. (10.0.0.1, 234.0.0.1), 00:10:11/...
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1k views

Regarding vPC Dual Active or Split Brain scenario

Consider the below topology: Imagine that both the vPC peer keepalive link and vPC peer link have gone down. I am trying to understand how will that lead to unpredictable traffic flows or loops. ...
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1answer
685 views

Multiple VLANs under one subnet (for traffic control)

Looking at a fiber ring network of 11 switches on the same subnet, with 3 types of devices per module (device 1, 2 & 3). control room switch 192.168.11.100 module 1 ethernet switch 192....
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1answer
309 views

Cisco 4948 - multicast routing

Could anyone help me with Cisco 4948 config? I have to route multicast traffic from one Vlan to another. Multicast source and multicast destination are IGMP-enabled devices, there are no PIM-devices ...
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2answers
303 views

How do you disable IGMP-snooping on virtual nic macvtap

Networking community, Question: How do you disable IGMP-snooping on virtual nic macvtap? Background: We have noticed that Juniper vSRX 15.1X49-D60 (Running on Ubuntu 16.04LTS Server KVM) is ...
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1answer
445 views

IGMP and Multicast

I have 3 hosts (h1, h2, h3) on my LAN segment and a router with IGMP enabled. Now the host h3 wants to join the multicast group (239.0.0.2 say) Host h3 will send a membership report to 239.0.0.2 (...
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3answers
9k views

Inter-switch IGMP on a VLAN with two switches, and a multicast source per switch

I have a network consisting of two HP 2810 switched. Attached to each switch is, on one port, a multicast video coder, and on a different port, a decoder. There are two VLANs - a control VLAN (...
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0answers
1k views

How do switches behave on multicast?

I am benchmarking multicast throughput of my LAN using an application that considers all the servers as group members. The network consists of homogeneous servers (S0-S9: 192.168.21.70-79) inter-...
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2answers
97 views

Multicasting - How to send a hint to the router?

I found a multicasting example at http://ntrg.cs.tcd.ie/undergrad/4ba2/multicast/antony/example.html. After correcting some errors, this program seems to work fine within our network. I now need to ...
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2answers
659 views

IGMP Query Interval

What adverse effects could occurred if I set the igmp snooping querier query-interval to 1 second in the switch? The default in switch is 60 seconds
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0answers
897 views

Cisco SG300 switch identifies itself as duplicate IP address

We've enabled IGMP snooping on one of our VLANs. The configuration used is: bridge multicast filtering ip igmp snooping ip igmp snooping vlan 1 ip igmp snooping vlan 1 querier We're now seeing the ...
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2answers
825 views

Multicasting questions

Ok, Basic question is this. show ip igmp snooping groups Is not returning the multicast groups I am creating More in-depth explanation. I want to test multicast. I am on a flat network, and I ...
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1answer
33k views

What are the benefits and cons of IGMP snooping?

Our new router is asking if we want IGMP snooping enabled. Not being familiar with this, I looked to the internet and got the following wiki description: IGMP snooping is the process of listening ...
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2answers
1k views

IGMP Multicast router overrun

THE SYSTEM: I have a L2 Managed 1Gbps switch with IGMP snooping (the switch I'm testing with is a TP-Link TL-SG3216). I have several identical devices (these are embedded devices that we are ...
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1answer
393 views

Is it possible to use group multicast (IGMP) over the internet?

I am looking at building an application that broadcasts audio using my own proprietary protocol. Under the covers I'd prefer to use IGMP or something where 1000 clients don't use 1000 times the ...
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0answers
264 views

Don't receive multicast traffic

I'm using multicast communications with IGMP snooping enable in the switch, I have 6 nodes (A, B, C, D, E, F), 3 sends data to different Multicast address and 3 receive data from every multicast ...
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3answers
627 views

Multicast Distribution with PIM

I have to receive some multicast groups for an IPTV platform. I can't use PIM (they don't give me an RP address for the groups...). The provider suggested me to do a join to each multicast group and ...
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2answers
4k views

why TTL value 1 in IGMP

why TTL value 1 in IGMP protocol and what are the different values possible in TTL section for Multicasting. What I got from the google is that if TTL value is 1 then it won't leave the LAN, but if ...
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1answer
980 views

Can we do destination port filtering in IGMP V2 or V3?

Is it possible to get a traffic from a multicast address with specific destination port using IGMP? For example, I have some multicast flows like 239.192.7.1:5000, 239.192.7.1:5001 to 239.192.7.1:5009....
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2answers
4k views

KEMP load balancers using UCARP (VRRP) - multicast MAC address not being picked up

Alright - been battling this for at least 20 hours consecutive.. Sorry if this seems like a long rant, or a blog post, but I'm getting to the point of exhaustion. So, here's the deal. We're using ...
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1answer
166 views

Igmp snooping based multicast forwarding

In Igmp snooping switch receives an Igmp leave report? Is it possible to change the timeout value in Igmp snooping switch?
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2answers
5k views

IGMP snooping and link-local multicast addresses

I have a network which has many devices sending data to 224.0.0.225 on a VLAN which spans multiple switches. Each device (aprox 12 of them) is sending reporting data at roughly 500-600 kbps. Each port ...